Optical fourier transform method for detecting irregularities up

Details Optical fourier transform method for detecting irregularities up Optical fourier transform method for detecting irregularities up

1994-01-31

1995-06-27

McGraw, Vincent P.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

G01N 2189

Patent

active

054284520

ABSTRACT:
The rapidly moving uniform surface being inspected is illuminated with either laser or wide-band light. The Fourier transform of the surface is produced upon the detector plane of an electronic camera. In the absence of defects, the transform light energy is produced only in the center of the detector plane but in the presence of defects light is produced in various non-centralized portions of the detector plane which can indicate the orientation and size of the defect.

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